My bet is that from now on (at least until the market crashes or some dude decides to buy like 100,000 of them) mining for SC will be approximately as profitable as mining for BTC. Once profitability goes up a bit -- say, 120% -- people will sell by the hundreds to cash in on the BTC. Once profitability goes down a bit -- say, 80% -- G/Hash falls, the remaining ones buy up the coins, price goes back up.

The 5X profitability worked until the network hashrate caught up with everything. Now, G/Hash is low, but difficulty is still up. If somehow the G/Hash remained the same and the difficulty dropped while SC value remained at it's current level, then you'd see 3-5X profitability again.